Circuit-controlling means



Nov. 10, 1925. 1,560,602

C. A. NELSON CIRCUIT CONTROLLING MEANS Original Filed Jan. 27, 1922 WITNESS lNJ/ENTOB.

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Patented Nov. 1 0, 1925.

UNITED STATES CHARLES A. NEIBSON, OF IBBOOKL'ZN, YORK.

cmcurr-comnonmne MEANS.

Original application filed January 27, 1922, Serial no, 532,235. Divided anathn application aim June 23,

1924. Serial 170. 721,867..

To all whom it may concern:

' Brooklyn, in the county of Kings and. tate 5 of New York, have invented certain new and useful Improvements in Circuit-Controlling Means, of which the following is a specification. r

This invention relates to the class of elec- 1 tric circuit-controlling devices wherein backand-forth movable means for makingand breaking the circuit is impelled to either limit by the action of a spring. One of the principal objects of the invention is to reuce appreciably the noise; which attends the action of such devices as heretofore constructed, and at the same time to construct the device so that once the circuit-controlling means has been moved in one direction or' the other past a "certain-position it will automatically continue to the limit of such movement, thusto comply with the fire-um drwriters requirement that in a device of this character the circuit-controller should not be capable of being held by the operator in a position for arcmg. v

' This present ap lication is a division of y application fi ed January 27th, 1922, Serial No. 532,235. I I

Fig. -1 of the accompanying drawing shows a circuit-controlling device embodying my invention, the same appearing part-- ly in horizontal section and partly in elevation; Fig. 2 is a vettical sectional view on the line 2-2, Fig. 1, the moving parts appearing each in true side elevation; and

Fig. 3 is a plan of a certain plate. 7 a is a supportin structure consisting here 40 of an insulating lock formedin two sections, one at the front and the other at the rear, said sections being clamped together by screws-b which pass through the sections from the rearand are screwed into exten- 5 sion plates or cars 0 bearing against and overhanging at the front surface of the block and provided with holes 0 to receivescrews or the like for fastening the block in a recess d in a wall. Between the sections extend the terminals e which are to be bridged in closing the circuit, each being securedto the rear section by a screw f and e uipped with the binding post g, access to which for attaching the wiring may be bad though with the recessing the .front section, as at a in Be it known that I, CHARLES A. NELSON, 1 1. a citizen of the United States, residin at l The block a contains a cavity h which as viewed in Fig. 1 -.is generally polygonal, concave corners. The opposite surfaces hand-h of this cavity. form coacting guiding surfaces or runways as will appear, and in the present example they are slightly concave. It will be preferable to 'form' each surface with a central rib so that there will result two grooves in, spaced from each other by the rib, as shown in Fig. 2. The bottom of each groove h appertainin to the guiding surface 12. may be former? by the inner end of the corresponding terminal e, which extends into the cavity as shown in Figs. 1 and 2;

. An elastic circuit-closing member capable of "rocking to""two reversely inclined positions (in which it coincides with the diagonals of the cavity) is arranged in said cavity, the guiding surfaces k h of which then coact with each other to hold said memcomprises two roller devices z'andi j,'each shown as including a spindle-i (9") having thereon a pair of rollers i '(j") to travel in rooves h; a stem is havin a forked bearing is for the roller a sa dle-piece Z sliding telescopically on t e stem and forming a bearing for the spindle of the roller device a, gitudinal slot is in "the stem, and a spiral spring m coiled about the stem and interposed between thesaddle-piece Z and a suitable shoulder on the stem.

Any means for rocking-the elastic circuitclosing member may be provided. In the present case I provide for this purpose a lever n which projects through a slot (1' in the block a and is fulcrumed on a pin 0 seated in notches a in the block at both sides of the slot, the in bein held in the notches by the top of a oss p slotted to receive the lever) formed'on a plate 72 that is secured to the block by the screws 9. The boss may be externally threaded to receive a threaded bushing r which-may serve to hold in place the escutcheon plate .9 shown by dotted lines in Figs. 1 and 2.

The elastic circuit-controlling member is shiftablefrom the position shown in Fig. 1

which spindle 1s movable in a lonin which roller devices are i din two of the diagonally related corners of the cavity to the positionin which its rollerdevices are engaged in the other two-such corners. In the position shown it is closing the circuit. groller. .device. 7' being electroconductive) rom one termnial to the other. The guiding surface ,or runways h h. coact with-each other to hold said member in tension and they are formed as shown, to tem I sion the same to .substantlally'the same degree when it is in one of said positions as when it is in the'other but to a greaterde gree when it is in any position intermediate the first two positions. Therefore when force is applied, as by-the lever. 1|, to shift one end of said member from the end of the corresponding guiding surface which it then occupies toward the other, the said memberwill undergo increased tensionin and ultimately the opposite end of sai member will be automatically sprung from. the end ofthe corresponding guiding surface which it initially, occupies to the oppo-.'

site end, thus instantaneously reversing the position of the circuit-closer .proper 7.

Each and of each runway forms a concave rise rising suddenly relatively to the remainder of the runway; further, the peri hery of each roller device 4' j forms in e ect a convex surface on the member with respect to which the corresponding concave rises are each curved to greater radius. This has two advanta ous results: Firstly, when the 'member is s ifted lever-fashion around its point of contact'withthe lower runwa -h it is impossible for the: o e'rator to old the member in a-state o equilibrium or dead-center position and its springing or jum ing is instantaneous 'once it es dea -cente'r relation to the lever act relative "where each is vertical as well as ahned way having a' concave rise risin 11, and, secondly .it assumes the new or reversely. diagonai position in the block a without the ta ping poise that characterizes snap switches eretofore known.

and lever never in practice assume theex- 'itions indicated by Fig; 2

with the other.

Havin thus fully described my invention,

what I c aim as new and desire. to secure by Letters Patent'is;

1. A circuit-controlling. device comprising, in combination, two coactin members.

convex surface in contact therewith.

. i It will be understood that the said member .2. A- circuit-controlling device comprising, in combination, two coactin members one of which is a circuit-control mg member and one of which has op oslte runwa s and the other of which is e astic and he d compressed between said runways and has opposite convex surfaces respectively in.

contact withsaid runways, the latter memher being free to shift lever-fashion around its point of contact with one runway and each runway having at each end a concave rise rising suddenly relatively to the remainder ofthe runway but curved to 'a greater radius than the convex surface in contact therewith. I

In testimony whereof I afiix m signature.

i CHARLES A. ELSON. 

